Safety lock or catch for shafts or elevators



Y(Mo Model.)

- SAFETY Loox 0R GATGH PoR No. 339,032.

C. C. THOMAS.

sHAPTs 0R ELEvAToRs.

Patented Mar. 30, 1886.

WITNESSES I JV VEN TOR .dttorney listino ldl'rnr CASH G. Vi"

Erice.

SAFETY LOGK @il GATi-i FR SHF''S @R ELEVATORS.

SPECIFXCATION forming part of Letters Patent No. $159,032, dated March30, 1886.

Application filed January 13, IESB. Serial No. 138,409. (No model.)

.To all wiz/0m, it iii/ay concern:

Be it known I, Unset G. THOMAS, citizen of the United. States, residingat Evans ville, in the county oi' Vnnderhnrg, Indiana, have inventedcertain new anc ful Improvements in Safety Locks or Catches for Shaftsor Elevators, or which the following is a speciiieation, refe.. ncebeing had therein to the accompanying drawings.

This invention relates to improvements in elevators, and has for itsoliglect to provide a strong, simple, dnrahle automatic attach ment/toelevators, whereby the descent of the platform, in consequence of anybreak in the hoisting npparatnsmill he instantly arrested, and therebyto the safety of this class of 'machinery hy preventing the loss of lifewhich frequently occurs when the hoisting-rope of an elevator breaks.This object is attained by the mechanism. illustrated inthe accompanyingdrawings, forming a part of this specilication, in whichm Figure l is anelevation oan elevator provid ed with this attachment. Fig. 2 is asectional view online w x of Fig. l. Fig. 3 is a scctional plan on linew of Fig. il; Fig. 4, a detached sectional view on line y y of Fig. 3'

enlarged. Fig. 5 is a detached enlarged plan of one of the lockingdevices.

The letter A indicates the freine ofthe elevater. B is a pulley at thetop thereof.

)is the hoisting-rope, one end of which is attached to a ring, E. D isthe platform, to which is secured a frame consisting of four uprights,F, placed on' the opposite sides ofthe elevator-frame A, thereby formingguides to maintain the platform Bin its proper position. The uprights Fare con nected to each other hy the transverse pieces f, either mortiseand tenen, or in ,any other convenient manner. the pieces f to eachother and leave an open space, G,vwhich serves the purpose toA receivethe locking devices H, which are preferably of castings of anysuitablenietal, and are provided on top with eyebolts h, have a roundedsurface where they come in contact at I, and also slots h', as well asserrated pointsat J.. Bolts K pass through each of the trans-l Shortpieces f connect verse pieces f, and also through theslots h', and thusform pivots upon which the pieces oseillate. Yokeshape pieces L,ha vingsuit-` 'near upon the -top'of th'epieces H andserve to maintain the.properdegree of tension' of the chains O While the platform is being.hoisted by means of the rope C, as Well 'as to cause the pieces Izl tohear against each other at I, and the points J to bear against theelevatorframe A, and thus prevent the descent of the platform D, shouldany breakage occur in the hoisting machinery. l Y

Having described my invention, what I desire to secure by LettersPatent, and claim, s-

1. In an elevator, the platform D, provided with a frame consisting ofVthe uprights F, transverse pieces f, and short pieces f', iu

.combination with the castings H, having the rounded bearing-surfaces I,and serrated points '.I, pivoted to said frame, the 'springs Q, and theframe A, substantially as described, and for the purposes set forth.

2. In an elevator, the

the topthereof the pulley B, the platform vD,

having uprights F, transverse pieces f, and short pieces f incombination witlt-he hoisting-rope C, ring E, chains N O, yoke-shapeframe A, having at pieces L, and bolts K, the castings H, andsprings Q,all arranged and operated inthe manner herein described.

In testimony whereof I affix my signature in presence of two witnesses.

CASH C. THOMAS.

Witn esses:

W. P. LEONARD,r G. C. PURDUE.

